Roller mill of the edge runner type

ABSTRACT

A roller mill of the edge runner type comprising a rotary grinding table and pivotally mounted rolls adapted to roll on the material on the grinding table, each roll being individually journalled in a respective box-shaped support which is inherently transportable and the supports are connected by box-shaped intercalated connecting pieces, which with the supports from a ring resistant to torsion.

limited States Patent [191 Brundiek et a1.

[451 July 9, 1974 ROLLER MILL OF THE EDGE RUNNER TYPE Inventors: Horst Brundiek, Rubensstrasse 26,

4044 Kaarst; Ludwig Werner, Schaferstrasse 17, 4000 Dusseldorf, both of Germany Filed: June 5, 1972 Appl. No.2 259,823

Foreign Application Priority Data June6, 1971 Germany, ..2128929 US. Cl 241/121, 241/107, 241/114, 241/117, 241/285 R Int. Cl. B026 15/14 Field of Search 241/103, 107, 110, 114, 1

References Cited UNITED STATES PATENTS 11/1917 Buckingham 241/133 FOREIGN PATENTS OR APPLICATIONS Primary Examiner-R0y Lake Assistant Examiner-E. F. Desmond Attorney, Agent, or Firm-Holman & Stern [5 7] ABSTRACT A roller mill of the edge runner type comprising a rotary grinding table and pivotally mounted rolls adapted to roll on the material on the grinding table, each roll being individually joumalled in a respective box-shaped support which is inherently transportable and the supports are connected by box-shaped intercalated connecting pieces, which with the supports from a ring resistant to torsion.

8 Claims, 9 Drawing Figures 9/1902 Germany ..241/1 17' PATENTEDJUL I 7 3.822829 SHEET 3'0? 8 ll ROLLER IVHLL OIF THE EDGE RUNNER TYPE BACKGROUND OF THE INVENTION The present invention relates to a roller mill of the edge runner type, and more particularly to such a mill with spring loaded rolls, comprising a rotating grinding table and several rolls adapted to roll on the rolling table and mounted for pivotal movement. Roller mills of the edge runner type with these features have been previously proposed in accordance with various constructions and with different dimensions During the course of rationalisation and attempts to economize in space in the case of mills with large outputs, the problem has arisen of further developing the construction of such roller mills in such a manner that the grinding or milling effieiency of a single mill with correspondingly larger dimensions can be substantially increased.

The present invention consists in a roller mill of the edge runner type comprising a rotary grinding table and pivotally mounted rolls adapted to roll on the material on the grinding table, each roll being individually journalled in a respective box-shaped support which is inherently transportable and the supports are connected by box-shaped intercalated connecting pieces, which with the supports fonn a ring resistant to torsion. In the case of a preferred embodiment of the invention, the ring consisting of the supports and the connecting "pieces is so arranged that it encompasses a drive, the grinding table and the rolls. The connecting pieces can, in this case, be constructed in accordance with the invention to serve as ducts for hot gases.

In accordance with a preferred feature of the invention a swinging lever of the mill is so constructed that the axis of rotation of the respective roll iscarried in a lever and this lever is supported in a detachable manner in a fork, and the roll together with a central part can be swung out of position.

A technical advantage of the invention is to be found in the fact that roll units of the same construction and size can be used and that each edge runner roller mill can be equipped as desired with two, four or more roll units. In this manner it is possible to produce economically edge runner roller mills with different capacities using a modular system, that is to say, with interchangeable units. In accordance with the same points of view, it is also possible to use supports of the same size for edge runner roller mills with different capacities. This type of construction also allows the use of a so-called summating drive or a drive with a power take off, so that in relation to the power the weight of the drive, the breadth of the drive and its costs can be reduced vis-avis a drive system using a single drive point.

The construction in accordance with the invention furthermore offers the possibility of swinging individual grinding rolls out of a housing of the edge runner roller mill and closing the openings forthe grinding rolls in the housing by means of suitable covers or doors. In this manner it is possible to operate, for example, an edge runner roller mill with four rolls temporarily with two rolls only partly loaded, in this case only two rolls operate. This is more particularly advantageous in the case of plant which are in a compound manner between a rotary kiln and an edge runner roller mill, since the necessity may arise for operating the rotary kiln with a reduced throughput, so that corresponding less gases 2 are produced which are provided for drying-grinding and dust removal in the edge runner roller mill.

The invention will now be explained with reference to a drawing showing a four roll edge runner type roller mill, in which there is the possibility of operating with two rolls under conditions of partial loading. It is most advantageous to operate with oppositely placed rolls for the purpose of even loading under partial loading conditions. Although the invention offers the possibility of swinging any roll out of position as may be required, as will be seen from the following description referring to the accompanying drawings.

FIG. I is a side elevational view of the main parts of an edge runner roller mill with its housing removed.

FIG. 2 is an enlarged side elevation, partially in section, of the construction of a swinging lever and showing in phantom lines the central lever part swung out.

FIG. 2a is an elevational view of the construction of the swinging lever shown in FIG. 2 looking from'left to right at the central lever part.

FIG. 2b is a further enlarged fragmentary section and lateral view of a portion of the swinging lever shown in FIG. 2a at the central lever part.

FIGS. 3 and 4 show in plan view and diagrammatically the arrangement of the supports for carrying the roll units with connecting pieces intercalated between them.

FIG. 5 is a side elevational view of an edge runner type roller mill and enclosing housing and with one roll shown in phantom lines in a swung-out position.

FIG. 6 is a plan view of the edge runner type roller mill shown in FIG. 5.

FIG. 7 is a fragmentary section showing a connecting piece arranged between the supports and in which the hot gas ducts are arranged.

FIG. 1 shows the main parts of the edge runner type roller mill in accordance with the invention, that is to say the box-shaped supports 1, on which a respective roll 6 with the swinging lever 3 are arranged. Each roll 6 is capable of being swung about the swinging lever pin or axis 4 together with the swinging lever 3. The rolls 6 run .on the rotating grinding table 7, which is driven via the drive shaft 10 and the drive 9. The plan view indicates that the edge runner roller mill has four grinding or milling rolls 6, of which three are visible in FIG. 1 for clarity.

FIGS. 2, 2a and 2b show details of the particular construction of the swinging lever 3. In accordance with FIG. 2a the swinging lever 3 comprises at the top a twoarmed fork. Within the fork a central lever part 17 is arranged, which is detachably connected to the fork ends of the swinging lever 3. The central part 17 of the lever has its lower end attached to the pin 4 of the swinging lever. In accordance with the representation in FIG. 2 the central lever part 17 is capable of being swung together with the swinging lever pin 4 in relation to the swinging lever 3. The central part of the lever is indicated by reference numeral 17 in the swung-out position. In order to obtain this possibility of a swinging-out movement, particular adaptations have been made: as FIG. 2b shows asa pin in lever 17 and a slit sleeve 16 is provided in which there is a conically shaped pin 20, which is pressed by means of a plate 23, screws 15 (shown diagrammatically) and plate springs 24 into the sleeve 16. By removing the screws 15, the pin 16 in the form of the split sleeve can be loosened. In the lower part of the central part of the lever 17 is a gripping or clamping ring 19 arranged to be secured by diagrammatically shown screws 25. By retracting the screws 25 it is also possible to release the gripping ring 19. In this manner, the central part 17 of the lever, as shown in FIG. 2, can be swung outwardly together with the swinging lever pin 4, while the swinging lever 3 remains in the working position. In the central lever part 17 of the lever 3, a trunnion, not shown, of the roll 6 is journalled. As shown in FIG. 2a, the swinging lever 3 is connected in an articulated manner through a pin 5 with a piston rod 18, whose piston 12 can reciprocate in a cylinder 11. The cylinder 11 is connected to a hydraulic unit 14 having a damper. By means of this hydraulic power transmitting system, the swinging lever 3 can be swung together with the roll 6 so that the roll 6 can be moved away upwards from the grinding table 7. In order to be able to follow this pivoting or swinging movement, the drive cylinder 11 is 11 is pivotally mounted at 13.

FIG. 3 shows, diagrammatically a plan view of a support arrangement for four rolls. Four connecting pieces 2 are provided, which are so connected with the supports 1 to form a ring resistant to torsion is produced. The parts 1 and 2 are firstly connected by screws and pins and welded on the constructional site to form the torsion-resistant unit. The box-shaped, intercalated connecting pieces can only serve for providing static strength, that is to say, as structural members. It is, however, also possible to construct the connecting pieces so as to serve as ducts for hot gas. FIG. 4 shows, alternatively a ring which consists of six box-shaped supports 21, which are connected by means of boxshaped connecting pieces 22 to form a ring resistant to torsion.

FIG. 5 alternatively shows a general elevational view of an edge runner type roller mill with four supports 1 and correspondingly intercalated connecting pieces 2. The view alternatively shows the central part lever 17, shrunk onto pins 4, which can swing in the fork ends of the swinging lever 3. Below lever 3 is the pressure cylinder 1] with the piston rod 18, which serves for swinging out the overlying roller 6 which is, however, not visible in FIG. 5. On the other hand, FIG. 5 shows the roll unit 6 in phantom lines at the right-hand side in the swungout position about the pin 4. In the lower part of FIG. 5 an opening in the mill casing is shown through which the drive 9 and the drive shaft 10 can be seen. The edge runner type mill will incorporate a casing or housing which is closed at the top by a lid or door 26. For swinging out the rolls 6, removable doors 27 are provided which free an opening 28 for the swinging out of the respective roll 6 in plan. FIG. 6 shows the arrangement of the supports 1, between which the connecting parts or pieces 2 are located. The so-called ring, consisting of the supports 1 and the connecting pieces 2 is generally square in plan. However, the construction, as is shown in FIG. 4, more closely ressembles the shape of a ring, that is to say, when more than four rolls are provided. The word ring is therefore used in this connection only to emphasize that a torsion resistant unit results which is in a position to resist torques occuring on movement of the grinding table and to cause such torque to be absorbed by the foundation, as can be seen from the view of FIG. 5.

FIG. 7 shows, in section, the construction of a connecting piece 2 incorporating hot gas ducts. Preferably two such hot gas ducts 32 are incorporated as is shown in FIG. 5. In the box of the connecting piece 2, an oblique piece of sheet metal forms passage chute 31, on which relatively heavy bodies from the material to be ground, for example pieces of ferrous metal, can leave the housing of the mill in the direction of the arrow 36 through an opening 35 which is also shown in FIG. 5. This opening 35 can be closed by doors 36. Above this passage chute 31, hot air can be passed in through the opening 32, and flows as indicated by arrow 35 obliquely upwards. Reference numeral 34 shows a stiffening piece of sheet metal on both sides of the connecting piece 2.

We claim:

1. A roller mill of the edge runner type comprising, in combination, a rotary grinding table, roll means comprising a plurality of pivotally mounted rolls for rolling engagement on material on the grinding table, a plurality of box-shaped supports which are inherently transportable and to each of which a respective roll is individually joumaled, box-shaped intercalated connecting pieces between adjacent box-shaped supports securing the supports in integrated relation and forming a unit resistant to torsion caused by rotation of the grinding table and rolls in engagement with material being ground.

2. The roller mill of the edge type in accordance with claim 1, a housing operatively associated with said torsion-resistant unit, and drive means, said grinding table and the rolls being substantially enclosed in said hous- 3. The roller mill of the edge runner type in accordance with claim 1, in which said box shaped supports include a swinging lever including an upper part in the form of a fork, a central lever part mounted within the fork, said central lever part being detachably connected with ends of the fork of the swinging lever, an axis pin shrunk to the central lever part so that the central part of the lever can be swing or pivoted together with the pin.

4. In a roller mill of the edge runner type comprising, in combination:

horizontally-disposed rotary grinding table means for receiving material to be ground;

support means comprising a plurality of supports spacedaround the periphery of said grinding table means, each support means including means for adjustably supporting-and-joumaling individual grinding rollers; edge-type grinding rollers joumaled on the means for adjustably supporting-and-journaling and being rollingly and operatively related to said grinding table means for grinding material disposed thereon,

said support means being subject to torsional forces resulting from reaction during grinding between said table and rollers; and connecting means interposed between and connected to adjacent support means and forming a torsionresistant, ring-like unit for absorbing and resisting torsional forces generated, the improvement in which said means for adjustably support-and-joumaling the individual grinding rollers includes a lever member intermediately pivoted on each of the respective support means on a horizontal axis of rotation, power means operatively connected to the lever member for adjustably imposing force on a lower portion of said lever member; a lever part including means independently pivotably and adjustably connected to said lever member; and journal means mounted on said lever part and connected to said rollers whereby each roller member can be selectably positioned from an operative to an inoperative position.

5. The structure as claimed in claim 4 in which said lever member comprises a fork-like member and said lever part is pivoted on trunion-like elements disposed parallel to the horizontal axis of rotation of said lever member.

6. The structure as claimed in claim 4 in which said posite direction.

' UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECT ION Patent No. 3822829 I Dated July 9 1974 Inventor(s) Horst Brundie-k, et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

['73] Assigfiee:

Loemcho Hartzorkleinerungs-Und Zementmoschinen K.G. Dusseldorf West Germany Signed sod sealed this 29th day of October, 1974.

' (SEAL) Attest: I

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents FORM M050 (0459) I uscoMM-Dc 6O376-P69 .5. GOVERNMENT PRINTING OFIICE: ".9 0385'33, 

1. A roller mill of the edge runner type comprising, in combination, a rotary grinding table, roll means comprising a plurality of pivotally mounted rolls for rolling engagement on material on the grinding table, a plurality of box-shaped supports which are inherently transportable and to each of which a respective roll is individually journaled, box-shaped intercalated connecting pieces between adjacent box-shaped supports securing the supports in integrated relation and forming a unit resistant to torsion caused by rotation of the grinding table and rolls in engagement with material being ground.
 2. The roller mill of the edge type in accordance with claim 1, a housing operatively associated with said torsion-resistant unit, and drive means, said grinding table and the rolls being substantially enclosed in said housing.
 3. The roller mill of the edge runner type in accordance with claim 1, in which said box shaped supports include a swinging lever including an upper part in the form of a fork, a central lever part mounted within the fork, said central lever part being detachably connected with ends of the fork of the swinging lever, an axis pin shrunk to the central lever part so that the central part of the lever can be swing or pivoted together with the pin.
 4. In a roller mill of the edge runner type comprising, in combination: horizontally-disposed rotary grinding table means for receiving material to be ground; support means comprising a plurality of supports spaced around the periphery of said grinding table means, each support means including means for adjustably supporting-and-journaling individual grinding rollers; edge-type grinding rollers journaled on the means for adjustably supporting-and-journaling and being rollingly and operatively related to said grinding table means for grinding material disposed thereon, said support means being subject to torsional forces resulting from reaction during grinding between said table and rollers; and connecting means interposed between and connected to adjacent support means and forming a torsion-resistant, ring-like unit for absorbing and resisting torsional forces generated, the improvement in which said means for adjustably support-and-journaling the individual grinding rollers includes a lever member intermediately pivoted on each of the respective support means on a horizontal axis of rotation, power means operatively connected to the lever member for adjustably imposing force on a lower portion of said lever member; a lever part including means independently pivotably and adjustably connected to said lever member; and journal means mounted on said lever part and connected to said rollers whereby each roller member can be selectably positioned from an operative to an inoperative position.
 5. The structure as claimed in claim 4 in which said lever member comprises a fork-like member and said lever part is pivoted on trunion-like elements disposed parallel to the horizontal axis of rotation of said lever member.
 6. The structure as claimed in claim 4 in which said power means comprises a fluid motor including a piston-and-cylinder combination.
 7. The structure as claimed in claim 6 in which said piston-and-cylinder combination includes a shockabsorbing fluid chamber means in communication therewith.
 8. The structure as claimed in claim 4 in which said connecting means between adjacent supports comprises a hollow common passage structure including means for conveying material away from said grinding table in one direction and an air passage portion conveying air to the grinding table simultaneously in an opposite direction. 